16 Apr Week 2 Discussion – The Entity Relationship Model 36 Unread replies36 Replies ???? Defining ?relationships within a database can improve search capabilities and ?optimal performance of the
Week 2 Discussion – The Entity Relationship Model
36 Unread replies36 Replies
Defining relationships within a database can improve search capabilities and optimal performance of the database in the long run.
- Identify at least two relationship strength types that can be used within the entity relationship model.
- Provide a real-world scenario that demonstrates each relationship strength classification, using the classifications.
- Be sure to respond to at least one of your classmates' posts.
reply to student below
Afolabi Ajagbe
1:44pm Apr 15 at 1:44pm
Hello,
An entity in DBMS (Database Management System) is something genuine and this is a real-world object with attributes, which describe the entity's characteristics. A person, for instance, is an entity with characteristics like name, age, gender, and so on.
In the schema, a strong entity is independent of any other entity. A strong element will constantly have an essential key. A strong entity set is a set that is comprised of serious areas of strength for numerous and is addressed by a single rectangle shape. The connection that exists between two powerful entities is symbolized by a single diamond. Notwithstanding, in the event that the relationship is between a strong entity and a weak entity, the relationship is addressed by a double diamond shape.
A weak entity in DBMS is an entity whose presence relies upon a stronger entity for strength and it doesn't have its very own essential key. A weak entity is addressed by a twofold rectangle shape.
I recollect half a month prior, I was arranging an excursion to another state and called Lodgings Focal booking registry to assist me with finding a close-by inn to the city downtown. The booking agent was able to find a good hotel, check if they had rooms available on the days I needed to stay there, and then finalize and book the room for me.
This is a modeling of actual entity-to-entity relationships.
- Hotels represent a "Strong Entity"
- Rooms represent a "Week Entity"
Their relationship existed such that without the Hotel there could not be hotel rooms.
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